Who could forget this:
PICARD: "They invade our space, and we fall back. They assimilate entire worlds, and we fall back."
Spineless cowards, right?
DS9 - The Way of the Warrior: The Defiant comes across some wreckage, and they choose not to take the risk of dropping the cloak to scan for survivors. They leave them behind.
And I already know what your response will be, Anwar, so I'll write it for you: "Funny thing is, if they did that on VOY, everyone would complain."